error scroll

for index in 0..<catalogs.count {
            print("\(index).\(catalogs[index].name)")
            let catalogScrollView = UIScrollView()
            let catalogContainerView = UIView()


            catalogScrollView.showsHorizontalScrollIndicator = false
            catalogScrollView.showsVerticalScrollIndicator = false

            catalogScrollView.bounces = false      // 滑動超過單張圖範圍時是否使用彈回效果
            catalogScrollView.delegate = self
            // TODO: For test color
            catalogScrollView.backgroundColor = .gray
            self.scrollView.addSubview(catalogScrollView)

            catalogScrollView.snp.makeConstraints { (makes) in
                makes.left.right.equalToSuperview()
                if index == 0 {
                    makes.top.equalTo(self.pageScrollView.snp.bottom).offset(10)
                }else{
                    makes.top.equalTo(self.pageScrollView.snp.bottom).offset( CGFloat(10*(index+1)) + fullScreenSize.width/16*9*CGFloat(index))
                }

                if index == catalogs.count{
                    print("set bottom")
                    makes.bottom.equalToSuperview().offset(-10)
                }
                makes.height.equalTo(fullScreenSize.width/16*9)
            }

            catalogScrollView.addSubview(catalogContainerView)
            catalogContainerView.snp.makeConstraints { (makes) in
                makes.edges.equalToSuperview()
                makes.height.equalTo(fullScreenSize.width/16*9)
            }
        }